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Hospital treatment is free to 'ordinary residents' of the UK. But if you are visiting the UK – to stay with family, on business, as a tourist, or if you are living here without proper permission – then you are likely to be charged by an NHS hospital for the treatment you receive

As such, since you're a Canadian resident, you're not entitled to NHS coverage through the normal route. Citizenship doesn't help, it's the residency (and hence paying for it through taxes) that counts

As a British citizen, you're entitled to move to the UK. If you did, you could register with a GP, and start accessing NHS treatments. However, if you're just visiting, and don't qualify for one of the exemptions on this page, you'll need to take out travel insurance with a health component / arrange for your existing health insurance at home to cover you abroad.